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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f12aaa4b4b774e82c3b1fed057cf62ba7eb7eb850fbda26905571486017ffb11' 
  AND token = 'ZDloxyWXe2tzSu7nRkBBkEdJGxw5vWxrX4jSxL5it14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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