The 3rd argument of add_options_page
is the capability required for this page to be displayed to the user.
Then to allow only admin to use this page, you have to set a capability which is only owned by admin, like activate_plugins
.
So change read
to activate_plugins
like this:
add_options_page( 'MyPlugin Options', 'MyPlugin Options', 'activate_plugins', 'myplugin-options', 'myplugin_options' );