SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '687a665163cdfaf15ecb621904c333292729bf089abd95fe62361b988fdba545' 
  AND token = 'CQCYBre3q5VjszQ0u6nIEsTNwQ+z0/O7WEEyKMQzUJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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