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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b906239943377607b5cf515871eda7d15352bea71abc151cd9a3bb007c3e4918' 
  AND token = '8HJGZNBtUZ9KyNV7lpsuLLHFrytwaJuB8wZd9JE0DWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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