SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8349d1a7723db7c2d04d8620fc56f9b2e4aaa7606c706473b5f0505b1e267394' 
  AND token = 'WLItYLb72ywHGVMQHlI9xS5xGdtWSPv+zjLRL0Aasmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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