SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0487f03ea4e9b7e443b0f8440e32c231d60eda53acc4a3449ddde228fa4b659d' 
  AND token = 'SKU2Nwy9PzGVeBmwY6wDIP2B7OLwmK5XGP3V7ubjphw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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