Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2b28e9b85e1b5790a18357170bba48ebbdaa3f5546adf2b34d5196ceb46c2b6' 
  AND token = 'TTeOSJdf1Rw+YFx7vBdd0o+/2CNyWXjdDZan9V02kOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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