SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e97fa405cd37489289f1e401e87dd51b13789f6e2b23fc13b2f53e4cf17c1ff' 
  AND token = 'BeyzmGgAr8ZySQfbPhpEjCPKj3YoSht+WMD+yZAEGvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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