No, transporting tokens in the request body sounds like a bad idea. There a specified HTTP headers for this like the Authorization header which wont be logged by most if not all web/proxy servers.
Anyways, if you are storing your tokens as httpOnly cookies which you should do, there isnt even the option to send the tokens in the request body but instead the tokens will be send automatically by the browser in the Cookie header.
If your client is not a browser but another server side application the tokens should be sent in the Authorization header as it is done in OAuth2.