SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2268b20a7356ab7e27c53c4648e07c4ca409c994513942b1ea90fd7b7f24546f' 
  AND token = 'kOEH9www+hJqzU8zY+L5R/JGDulJ93euxU9jZv+gjRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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