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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19703c5b05765f2e4e2837fb1bc72b39fcdbb8e5b0fee8e1da7ab6e7b853511b' 
  AND token = 'zqKvblXeMH92ASWUpnBbT0ymOE6zrasC/tUHWkam+Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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