You have an SOng ID (notice it starts with SO) so you want to call song/profile, not track/profile:
http://developer.echonest.com/api/v4/song/profile?api_key=XXX&format=json&id=SOKLJRV13ADC0371BD&bucket=audio_summary
audio_md5 and md5 are different things. audio_md5 is a hash of the audio content of a song while md5 is the hash of the entire file.