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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c649b9c4adf4c2baa4f1a0afe562567a57bc9a7d9f581f0936229c804eecb6c3' 
  AND token = 'wKy9xSjnlERxwk9tm6QjBQnI3484JPtSLMRHGGNKFIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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