SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4d5c45e495b323f0b7237456669e98de8584713318f7e46eb7803e2a8444a0b' 
  AND token = 'rdTSb2WnAclQUvPhK5RMXXIVZRGhxJB4IrbzrSkDqgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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