SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77724ea1f1cfa8394bcc98a80fb5a47647daf015a59af1c8442835ed4eee2bf1' 
  AND token = 'qgOr9kiwPvRTXA2MtEV6Is+hm/ap/7vFmOJfytKFVT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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