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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4d324769becaa80c53e36188c8fdc1409d13b174bdebbddd228f4d8882ad9c7' 
  AND token = 'ZG0vwyY0nOo6IKaFwv38f7WvLcQb8eYh1iFdqccDtN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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