Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd99984ddfe81416a3895db1682a7ddb502e50cc9b55eae41cc2d7801feeee182' 
  AND token = '8LIjpV5Ws0aDHwJeMAK98pcFojjKjKT1/YdZYEl12fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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