Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9ae94933ad86b2abfa5072a946d77e8c8b0c875ce8a4f721991bf0ac9ddf7a4' 
  AND token = 'W+lAEbtP0YHEmc3lLtgybzUzRnDKSE6y0nKbBMGNWqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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