Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e21891319dd55ba195b2a6221278257348e5d0658443d8e52887db4f16c3f4a' 
  AND token = 'wIIMQDRRK2+NzfTE2GkS7dWB7r49B9wc521zpWiNt4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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