SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a60df69b4f6070a229513e9bf1122e9446f7fbe0bfcb8012197094efb1858fad' 
  AND token = 'bBY8VkVBtRrD2p86Hq4M/wujEZpX6IMZ4ovvlFPzKYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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