SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46dcb86d2b578aad9113dc25bc7f719c82ff0f077533ac435178dd1765a1d8de' 
  AND token = 'OOCVUupTOFGeUhLPLxvJEUGznZuzD+NvqxHVrF7J+CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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