SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7aaf1abc46e556c50994fe0b7f070e093ab1474800c7d6f53c4b25bfeb71c32f' 
  AND token = 'P/S3gL1Ba/mTZWjXzrWnJyT0Otm4GaXggOYPi+5rw7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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