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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8254e98afb2c834d962a3b97415dfd9b3b394a50a90f8637096a1de64c15cd1d' 
  AND token = 'ygfyb5FyuU3xbnLDwx55bQRZafq1m735K9JC3L9h16I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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