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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73180932d5b0ce8a0927afa149efa923a849c0dfc954c1118e740f3d068ac317' 
  AND token = '7bKHOlbHJzM7ViHFWNWXbYmXOARENLOxw/N5wUoETT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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