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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c811fb19f7d797e0f45c7d99621da0cb27a46af818fc799585d32fb1fef7788f' 
  AND token = '3IOGHAxbX+h/h9ii+6dwlXF0zEUiIvcAxBbXSeltbUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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