SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a170f49327a98d2b5fbcb84b6d556fbad41f8872cedd3d0945dedf0bfc6f6568' 
  AND token = 'Mdi1nxJaUHbKko+wqfsRoBD1AGNWbth4L6+nvqWLlqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}