SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09f042d42a6890f770150265c9565814a9c93181144ae100c9d9a41d9e844bed' 
  AND token = 'CHCtQ6JZZfiAPOf5hjkn7aK3+wghvnjYbzV2fUA9tPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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