SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b8ed0c9f7d1c628a9be5f3002f94f3f55b5d5ba38129ab9637483b73f67107c' 
  AND token = 'wjU7TCvyMPB2JLinudKfVrQ0ES81GDv+bgtfFcccHHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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