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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb44e680b853a7b563b1762780d675f4d7f1f7214b8b43819da3b148c280deb3' 
  AND token = 'ok594MnqYkBfS6PtclOq+T4oN7skZ0nwNiaHUGU0tFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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