MySQLdb does not support Python 3 but it is not the only MySQL driver for Python.
mysqlclient is essentially just a fork of MySQLdb with Python 3 support merged in (and a few other improvements).
PyMySQL is a pure python MySQL driver, which means it is slower, but it does not require a compiled C component or MySQL libraries and header files to be installed on client machines. It has Python 3 support.
Another option is simply to use another database system like PostgreSQL.