SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae7430d206fb2924ce98aaed629d627e879f14b7db35515df914f7f78234c9e8' 
  AND token = 'mRpwVbLBAuPwKXpIrgH17vPpZh8wmE0vutYSXYOg9GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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