Here is the one of the Ansys Innovation course link that will make you familiarise with explicit dynamics.
Time Integration - ANSYS Innovation Courses
However, there's no public video format explaining the workflow of blast/explosion simulation in Ansys Innovation platform right now. So, I'm sharing couple of our channel partner's video links that will be helpful to you.
Ansys explicit dynamics explosion simulations - YouTube
Explicit Dynamics in Ansys Workbench at a Glance - YouTube
All the best,