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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0881c1154fb3af79eec8010a4fbe4254c07b2ecea2af1ee59365a8037ce5c2f' 
  AND token = 'jcqezEBT37Rci89wT6KYw5Y+eRGBSldfo0hHqlhOHGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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