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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3532f8a1c118409d0c000ddc7534f22980a26a3f66f35e5dbe90cdc8b7b3b5fb' 
  AND token = '+l0/ZTef4qJ5+5A0tGtE5hFg7ncokMynBvhqiph/3ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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