SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88bfc43f21b1f1f9573ab4c68528b4fb465071b167b599f19e987cb938f6e8f5' 
  AND token = '/MuxgdqTBlzMmBfKX/TLH99W84CTI8wMeL9x+VZUhNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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