Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5afc9f88c1d2ee2d9ea4358ead5522e21031eca6229b5d9af9b04c375e54ed87' 
  AND token = 'LUwtehxzewEZdplq3Znsx9F7bk++eubItPlkKh3Au7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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