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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39b7477a2af52ea63b9f52afc0eaa4ecbb87951bfb7dd65b49d0924f973bd410' 
  AND token = 'lS6tSqNoqIY3FrX3tlHra4gbBTbJ3zp5rwnKh9TMZEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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