wp_ajax_aioseop_activate_plugin

See hook in action

See this hook used in plugins:

Select Pluginall-in-one-seo-pack.3.4.2all-in-one-seo-pack.3.4.3all-in-one-seo-pack.3.5.2all-in-one-seo-pack.3.6.2all-in-one-seo-pack.3.7.0all-in-one-seo-pack.3.7.1