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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '198b5d7f65507bbb4efdc1a3e1f6f8ec176eb7bbe6cee839e368d041a7692c63' 
  AND token = '8ud/ZDIReRvsGC+v15mygcn0ftSbnt59sRzQA0YMQWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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