SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a3de2eb0270da192a9feccc212357a3f12f458f4c3535d9c679913a0dcba4a9' 
  AND token = 'Y55NdKXqxW+XQhn/LotBp+4viW4gOrxjJUgC1Nuh8CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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