SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03a0bd0c2c99e9f81e392fa82665f5bebde6b541bcc00b499c25f72c178486db' 
  AND token = 'rTENV9nJtuFChJtBDGOxU+4ZxarwwgkPU/Fin9727sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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