Buy Minecraft Java Edition from Microsoft. Use the official launcher to roll back time to Alpha 1.0.16_02. It is safe, it is legal, and it costs less than a pizza.
Do not download the APK. You will either get a virus or a broken texture pack. Keep your device safe, and enjoy the real Alpha experience on a real computer—the way Notch intended.
Have a copy of Alpha 1.0.16_02 from 2010 sitting on an old hard drive? You might be sitting on a digital goldmine for collectors. But as for an APK? Move on, miner. That tunnel leads to the void.
Java Edition runs on the Java Virtual Machine (JVM). It is designed for keyboard/mouse input and x86 computer processors (Intel/AMD). Your phone uses an ARM processor. You cannot run a Java Edition EXE or JAR file directly on Android without a complicated emulator (like PojavLauncher), and even then, it is not a native APK.
An APK (Android Package Kit) is the file format used by the Android operating system to distribute and install apps. Minecraft: Bedrock Edition (formerly Pocket Edition) runs on APKs.