SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '861f6f25035e82b9eb6623cdc92c783ecb24f5c1061a31bc591784b8ddad304a' 
  AND token = 'VfX+vKw5JVwTnYpL/LSa22RouuGEc/J7qdTxZGGNmTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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