This app was mentioned in 4 comments, with an average of 0.75 upvotes
Are you able to push install it via web browser? https://play.google.com/store/apps/details?id=com.hbo.go
HBO go in the play store reports it IS (at least) compatible with the Mi Box.
https://play.google.com/store/apps/details?id=com.hbo.go&hl=en
There's actually one HBO GO app for Android TV, but it's only available in the US: https://play.google.com/store/apps/details?id=com.hbo.go