SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4b6fb95d3ebe48f4bc0e884d2fc0cb3bd155ce5c2bd83c7812ca870c2bc99dc' 
  AND token = '+Q7J7MCkYHNW3Fgj4p9zhtq/6lnWhy7e3KChpyHq1jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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