Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3998eb69bf6c85d9dc16e0dcb85ead7d2bb263e78877846a0bae392c3d2818ba' 
  AND token = 'FIOol+vRED/P9ad5R0/XZ9Bl9wOGSJn43ba5ZZ8upNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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