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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94a3c1dfe4856828373d3dc5bb6c4f304bf0a571681d89b464ccde8ba17ac25b' 
  AND token = '2+bQzM9WA2aArlzIeqDgtGrKPh7qiqe7sbYb4o3Io5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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