SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '665e08b9c3d8647a871dd3f5fc675e8433d66228577b5ea0a82a2f619c1c9cbe' 
  AND token = 'yCI4xYwVzSVUFiR1OAOjNEB9atwjXGxZAZ/dXXTQDlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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