SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd011b4a1bbc5368702a62e6d98d0182a69b5ab09f6090f4de9b4f47943829579' 
  AND token = 'w4YXEqDKnpML2V01tsyrCXTEj21IKhovjcJn+aOXqDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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