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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b5994d67e039acb8a78eaa07c1f4b3b1c03970471b98bf24017e3df58a97411' 
  AND token = 'yUnZVJlzkAfVueeU8rFj/sq0mduf1rTuRgsBtqWNtB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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