No, your Windows 7 computer is not protected by MSE after January 14, 2020. MSE is unique to Windows 7 and follows the same lifecycle dates for support. Learn more about MSE.
" Microsoft Security Essentials (MSE) will continue to receive signature updates after January 14, 2020. However, the MSE platform will no longer be updated. "
Suggest reading everything here: Answers to common security questions - Best Practices
Pinned until 12/25