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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d9841bfe263f714aea390c9da3791857c13781b4d2d0434379f1ef7f6da3f7d' 
  AND token = 'C+LCDavQKHtyyQ+Ewk8X/xj1Hk4PAWq4MQ6vDlruenc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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