I always get "app-release-unaligned.apk". I can not get "app-release.apk". But before I updated the Android SDK, I can get "app-release.apk" and "app-release-unaligned.apk" after clicking "Build-> Generate Signed Apk ...
Mac OS system. Android Studio 1.5.1. Android SDK Tools 25.1.1. Platform for Android SDK 23.1. Android SDK Build-tools 23.0.3.
I found a similar problem on Android Developer Tools Google Plus
UPD1 I used cmd to align apk. Because I could not publish my application on Google Play. zipalign -v 4 your_project_name-unaligned.apk your_project_name.apk .
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