SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ba5840a5b05801cf1f8477ca4f436a52591be974f29029365e1faaeb7b16166' 
  AND token = '79JUq63RgZvZMHYXCg9Ox9JKeDDckClyY8oYxwX3PCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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