Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a258e9b89bf08ad8bd24977ddcd8f4f6092850f979f24780f4ecd16228d70a39' 
  AND token = 'i4Q8caPxTqMEH4EXO9QqY0JhaSU+eaqFUKj4nlyd2Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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