How to get related to db.Model entity from datastore - what API allows it?

How to get related to db.Model entity from datastore - what API allows it?

I want to read related to model entity. What API I should use?
For example:
class DeleteMe(db.Model):
x = db.FloatProperty()
DeleteMe(key_name = '1').put()
How to read raw entity from datastore for key_name = '1'?