SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4e23d687f51e31bc10ad7c12ac92680970ced9e1bdecef6c20535f4654a5a60' 
  AND token = 'XoPoDhp3is+Dc+JFwM1xENHBBIuDEtV00/HvGIhV29w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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