SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45b2bf6045865beefaf89262c95c7193ad93751ac71e43f25f7520d5e32b6243' 
  AND token = 'DS4MjeQe0b1+sX+lVkiaw7da88F92KVh+/AOqY8mQvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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