SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a120f65a40da4bca74432696cb3b7353bd657cc424b67768e2265cfcc8f81dc' 
  AND token = 'Bd+y9Wwst5W9BQV8hmKvem/hnYNc8jMHXMhNj7iXjeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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