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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '851141c6333a71574b4ca8c969eda5ee26ddae443445b3a895fea6f2774f52cc' 
  AND token = 'cwruKM85i+WlWowbICwj3UcnDakuQWMUZzmfc8uvAmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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