Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd2c4e15a49c6940a15076cc78dc635b58a83fd451a6d8e65af1f891e85c6564' 
  AND token = 'HmieiOrZlGpcNGU1DK0tFbK4ZxBqvgd8fC+B959eYik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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