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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcc578a22ac242493aba28e5a3db5bf11efb76cae12dd6024e51cd1e56ea32e1' 
  AND token = 'd6tGI3jD4/q0A3RY3W2MunBKog1SKjK0JvfjivHI+jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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