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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '307eed71b839b72177da87929dee626c552a07791f245d9c3de214274ba8b71c' 
  AND token = 'Gokz1jlGH9QUH5PLpK+oji1GlnpylD2k3zItXNccAEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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