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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c705c52dd87babc67d0e6358a827c9168d802c6ac84e94b0d8a43688beb4309' 
  AND token = 'wf9hq9lc+vS5UdyvWalZYyhDJ6+3L3n+nh6XNQRbgto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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