Apart from the back-end 'quick logout' function that you mentioned, there is no 'search and logout' function in J25, as far as I am aware.
In the Login One! Premium edition, which can be downloaded for EUR 4.50 only, you can allow multiple log-ins for specified user groups, e.g. administrator, author, editor. This means that these user groups are never denied simultaneous log-ins. But this may not give what you are looking for.
In the Business edition, you can allow multiple log-ins for specified user IDs. So if the user(s) that you are referring to are a limited number of IDs that will not change, you could use this.
But - all in all - Login One! does not have a 'user logout' function.
I hope this helps.

Hi there,

I am the super admin, and using Login One! on my site. There are times when my users unknowingly log in, but for some reason need to log back in. I would like to be able to "Log Out" these users from the back end, so they are required to log in, WITHOUT having to wait the 15 minutes.

Is there a way to do that? I know the Site Control Panel has a "Quick Logout" function, but only for the 5 most recent users. Is there a way I can search for a user in the user database, and remotely kick them out from the backend?

Thanks!