SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7091d24b7877343b534b1de2efab1ee20e431be5acb310b5710f1309d0360659' 
  AND token = 'FvRjmFLk+YPMTqFrqi0IwLPo7SXjXZ/tGbedfymgtzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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