There are lots of exemplary input files in the documentation (Benchmarks, Example problems and Verification Guide). Search for those that involve Abaqus/Explicit and download the files that you think will be useful for you.
To access the current version of the Abaqus documentation you will need a Dassault Systemes account. Then search for Product Documentation and select User’s Guides. Help menu in Abaqus/CAE will direct you there as well.
Example problem manual has lot of Explicit examples.
One time activity for example problem file download- Go to directory-C:\Win64App\ABAQUS20xx\SIMULIA\CAE\20xx\win_b64\SMA\samples\job_archive. Extract the samples.zip file to another folder. Open new database in Abaqus. Import the required example problem input file in model from the unzipped folder.