Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7168a6cdf27cdf9f806812e9e3235774e9716a443da7208957cce92fcdfc7ff5' 
  AND token = 'blTNZo1lZ8kRvnJQz+015zjxFakooMQJJ5wAM/yu0z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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