SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a0222a0a3db49df81cdaadf199d4b07e2d16cedfc34a1f3b58790f7ed807457' 
  AND token = 'KRgB5C89uvCeoTrAwUdhI5XozI1hKJqp+B4RYhyodjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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