SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e7ef6d6102f4de737bd63bee55c73a89a456102cf73777c52ead8655fa49d4a' 
  AND token = 'qJhtxCWLBduJEpvz6oqa0Ic4ZXX//wUbbhbksyWpYWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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