?
You could use the ExtensionConfiguration_GetConfiguration method, e.g.:
EXEC [dbo].[ExtensionConfiguration_GetConfiguration] 'Inedo.BuildMasterExtensions.Artifactory.ArtifactoryConfigurer,Artifactory', NULL, 'N'
and get the Extension_Configuration column, which contains the XML serialized properties of what you need - some simple XPath should be able to retrieve them.