Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5754a2afc61e8a8a65a9a8f89a5f235dc3aa07de479a65d3002f7b30d1d88ee' 
  AND token = '/WITW1QJ9NdqlUUs2Y0IxbbUnLzCON1Y/2wAlpCPiKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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