Hello and thanks for your post.
The application process is truly holistic, and committees will look at your stats (GPA and GMAT), work experience, and extracurriculars.
Your GMAT is very strong, though compared to others in your demographic, it is about the average. If you haven’t already, I suggest taking it up to 3-4 times. You have nothing to lose since schools will only look at your highest score. And even a slight increase can boost your profile. (As for your GPA, I am not sure what you are referring to regarding GPA Matrix.)
It is hard to gauge your work experience without knowing your accomplishments and impact you have made there. It is nice to see you are employed by a well-known firm. However, the average years of work experience is closer to 5, so if you choose to apply with one year less, make sure you demonstrate why now is the time. (Keep in mind that internships generally do not count towards full-time experience.) And because of your slightly lighter experience, it’s even more important to show you have made an impact and demonstrated leadership there. Ideally this will be supported by a strong recommendation letters as well. It will also be important to explain why you want your MBA, and to also illustrate the skills you already have which are transferable. Be sure your story makes sense, and is realistic and specific.
Regarding extracurriculars, ideally you have been involved in some. If not, it’s never too late. And do your best to take on a leadership role in one.
You may have a chance at LBS/INSEAD, but they are extremely competitive, and each school simply does not have the room to admit all the world's qualified applicants. For that reason, I suggest apply to a few other schools- reach, target, and safety. Hopefully your choices will see that you have a compelling story and are someone who will add value to the classroom and community.
If you would like to discuss your story or anything else in greater detail, please sign up for a free consultation.
Good luck!