SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ab2a4d7b3d4624818d53310723054d92ce6171921bc20092af4e0fb42a22cc4' 
  AND token = 'NQpLqje/YLOs/eoUC7DCxKOh3HVM+xG+4ZFX35LWWZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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