SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6739dc624832e8351bdfaaaa7e136b2ac6facf6ddbd83804c895ce4f836b30e8' 
  AND token = 'TqE/CNG5ZJwEcKbpYnbDaUsvfyRU5whbs0ZHqlgCq40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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