you can get a token for a specific use By using log the user in inside backend workflow.
just create a backend workflow which take two input email and password inside the workflow use the login action that set when you call this workflow it will generate a token for that specific user and return the token.
Note: you hv to call the backend workflow from API Connector, i also suggest to use a token even for api Connector to authentication the call gen a token from editor so the call you sre making is authenticated.