SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '589113cfec71041f88d5820db7deb4181367de3d5c0c50bd390e0466b07c3b9f' 
  AND token = '+olhmJ9BXpC3sJd7cjBgB+6h74dmMzOs7e/mxLtpFzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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