Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '555fea1aee431dc235ffa6d5a67a8cb28fd6b8caf51598f0b8a5a2affb1ec8ae' 
  AND token = '3vIuaezXsm3kRYmkjEJ0pa/crzHLg+1Jlgb8eOTsQiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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