SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d56e2bf736f5daf0bfc9a22a4af9d37a2091f30a0fc383031d790f707334c1b' 
  AND token = '+ugTUR9cThqDNvjRAFvlw6jQido8g/GQPi8F+a1Oz4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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