SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a610480ad1cc29675d4633b9896dd5123f97a71228b28e5ae22dbf9d4f45227' 
  AND token = 'zTQnw/LPcFQHKvXSxubBoE+womUkqYijEEXZc7GN0bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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