Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2bfbd6cd7cd6cf66f7036fcde40b1bd13bb6c36e700f8da69f21d7212e6d8c4' 
  AND token = 'ctinLBEQRbLUR6HY8aZLkDYgyHUsSUGbf9RwGSRXgt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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