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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '468c6e97d0f6be59a0d11bbd217a76dd3d75ae5d606954da02ac9fb3acfdffd1' 
  AND token = 'LlTIJZnpKfQr8FdUARAz7S8wmweRsnDw5WlzYXXagXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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