SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10730ea38b52ce921c3b98042f9c0af5f3678327c2f7e0c2e3ab76a6813d9603' 
  AND token = 'DBxY7diBPJia4DV53EktS3okoPwWBLuV4jQ4KCyzfhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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