Is an elapid snake bite curable?

Depends. The elapid group contains ~300 species with a variety of toxins within their bite. Where access to urgent & critical care services & Antivenin is available recovery is possible, although difficult. See: www.Ncbi.Nlm.Nih.Gov/pmc/articles/pmc172667/?Tool=pmcentrez.
Yes. Yes, there is Antivenin for most elapids but elapids are extremely dangerous and have very deadly neurotoxins which can kill quickly. If bitten, seek immediate medical care!